feat(i18n): localize main page and enable i18n for homepage texts

- Updated index.tsx to use <Translate> and translate() for all main texts (title, subtitle, CTA, description) — now fully i18n-ready.
- Added new translation files (code.json, navbar.json, footer.json, etc.) to support Russian language for homepage and UI.
- Enables seamless language switching and correct translations of homepage elements.

website/src/pages/index.tsx

@@ -5,6 +5,7 @@ import useDocusaurusContext from '@docusaurus/useDocusaurusContext';
 import Layout from '@theme/Layout';
 import HomepageFeatures from '@site/src/components/HomepageFeatures';
 import Heading from '@theme/Heading';
+import Translate, {translate} from '@docusaurus/Translate';
 
 import styles from './index.module.css';
 
@@ -14,14 +15,15 @@ function HomepageHeader() {
     <header className={clsx('hero hero--primary', styles.heroBanner)}>
       <div className="container">
         <Heading as="h1" className="hero__title">
-          {siteConfig.title}
+          <Translate id="homepage.title">CherryPick</Translate>
         </Heading>
         <p className="hero__subtitle">{siteConfig.tagline}</p>
         <div className={styles.buttons}>
           <Link
             className="button button--secondary button--lg"
-            to="/docs/intro">
-            Explore CherryPick Documentation 🍒
+            to="/docs/intro"
+          >
+            <Translate id="homepage.cta">Explore CherryPick Documentation 🍒</Translate>
           </Link>
         </div>
       </div>